High-Frequency Measurements of Acoustic and Entropy Disturbances in a Hypersonic Wind Tunnel

Experimental Investigation of Roughness Effects on Transition on Blunt Spherical Capsule Shapes

“…Transition experiments were performed in the hypersonic Ludwieg tube at Technische Universität Braunschweig (HLB). This blow down tunnel was initially calibrated by Estorf et al [17] and has been used for various experiments of freestream disturbances [18], [19]. The tunnel comprises the partly heated storage tube, the Ma = 6 Laval-nozzle, the test section of 500 mm in diameter and finally, the dump tank.…”

Propulsive jet influence on generic launcher base flow

“…To characterize the disturbances of the flow field, the combined modal analysis theory is employed [38]. By using a Pitot probe together with hot-wire anemometry, the disturbances of the freestream are decomposed into three different modes, entropy mode, vorticity mode and sound wave mode [39,40].…”

Research on Hyperbola Fitting Algorithm for Turbulence Level Measurement Test Data

“…According to the literature [26][27][28][29][30][31][32], the response function of the constant temperature hot-wire anemometer (CTA) in compressible flow is…”

“…e LS method has been widely used due to its ease of application and high computational efficiency [21][22][23][24][25]. Both Lebiga VA [12,26,27] and Radespiel R [28][29][30][31] have done a lot of research in the field of turbulence level measurement and obtaining the fitting solution in compressible flow. ey conducted a comprehensive and thorough analysis of fluctuation measurement results, which provided data support for the uncertainty analysis of subsequent wind tunnel tests.…”